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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
Borcherdt et al. (1991) showed a correlation between amplification of ground motions and average shear-wave velocity of the upper 30 m of the earth (VÂ¯s(30)). They then prepared a map that grouped the geologic units in San Francisco into four shear-wave velocity classes.